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State Highways

Use the same relation tagging scheme for Michigan State Highways as for Interstate Highways Relations, except use network=US:MI, US:MI:BUSINESS, US:MI:DOWNTOWN, US:MI:FUTURE. Don't give the relation a name=* unless the entire state highway has exactly that name all the way.

Until all renderers fully support highway relations, it is probably also a good idea to tag ref=M xx on the ways making up the relation.